1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462
|
/*
Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
#define MYSQL_LEX 1
#include "my_global.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_priv.h"
#include "unireg.h"
#include "sp_head.h"
#include "sql_trigger.h"
#include "sql_parse.h" // parse_sql
#include "parse_file.h"
#include "sp.h"
#include "sql_base.h" // find_temporary_table
#include "sql_show.h" // append_definer, append_identifier
#include "sql_table.h" // build_table_filename,
// check_n_cut_mysql50_prefix
#include "sql_db.h" // get_default_db_collation
#include "sql_acl.h" // *_ACL, is_acl_user
#include "sql_handler.h" // mysql_ha_rm_tables
#include "sp_cache.h" // sp_invalidate_cache
#include <mysys_err.h>
/*************************************************************************/
template <class T>
inline T *alloc_type(MEM_ROOT *m)
{
return (T *) alloc_root(m, sizeof (T));
}
/*
NOTE: Since alloc_type() is declared as inline, alloc_root() calls should
be inlined by the compiler. So, implementation of alloc_root() is not
needed. However, let's put the implementation in object file just in case
of stupid MS or other old compilers.
*/
template LEX_STRING *alloc_type<LEX_STRING>(MEM_ROOT *m);
template ulonglong *alloc_type<ulonglong>(MEM_ROOT *m);
inline LEX_STRING *alloc_lex_string(MEM_ROOT *m)
{
return alloc_type<LEX_STRING>(m);
}
/*************************************************************************/
/**
Trigger_creation_ctx -- creation context of triggers.
*/
class Trigger_creation_ctx : public Stored_program_creation_ctx,
public Sql_alloc
{
public:
static Trigger_creation_ctx *create(THD *thd,
const char *db_name,
const char *table_name,
const LEX_STRING *client_cs_name,
const LEX_STRING *connection_cl_name,
const LEX_STRING *db_cl_name);
public:
virtual Stored_program_creation_ctx *clone(MEM_ROOT *mem_root)
{
return new (mem_root) Trigger_creation_ctx(m_client_cs,
m_connection_cl,
m_db_cl);
}
protected:
virtual Object_creation_ctx *create_backup_ctx(THD *thd) const
{
return new Trigger_creation_ctx(thd);
}
private:
Trigger_creation_ctx(THD *thd)
:Stored_program_creation_ctx(thd)
{ }
Trigger_creation_ctx(CHARSET_INFO *client_cs,
CHARSET_INFO *connection_cl,
CHARSET_INFO *db_cl)
:Stored_program_creation_ctx(client_cs, connection_cl, db_cl)
{ }
};
/**************************************************************************
Trigger_creation_ctx implementation.
**************************************************************************/
Trigger_creation_ctx *
Trigger_creation_ctx::create(THD *thd,
const char *db_name,
const char *table_name,
const LEX_STRING *client_cs_name,
const LEX_STRING *connection_cl_name,
const LEX_STRING *db_cl_name)
{
CHARSET_INFO *client_cs;
CHARSET_INFO *connection_cl;
CHARSET_INFO *db_cl;
bool invalid_creation_ctx= FALSE;
if (resolve_charset(client_cs_name->str,
thd->variables.character_set_client,
&client_cs))
{
sql_print_warning("Trigger for table '%s'.'%s': "
"invalid character_set_client value (%s).",
(const char *) db_name,
(const char *) table_name,
(const char *) client_cs_name->str);
invalid_creation_ctx= TRUE;
}
if (resolve_collation(connection_cl_name->str,
thd->variables.collation_connection,
&connection_cl))
{
sql_print_warning("Trigger for table '%s'.'%s': "
"invalid collation_connection value (%s).",
(const char *) db_name,
(const char *) table_name,
(const char *) connection_cl_name->str);
invalid_creation_ctx= TRUE;
}
if (resolve_collation(db_cl_name->str, NULL, &db_cl))
{
sql_print_warning("Trigger for table '%s'.'%s': "
"invalid database_collation value (%s).",
(const char *) db_name,
(const char *) table_name,
(const char *) db_cl_name->str);
invalid_creation_ctx= TRUE;
}
if (invalid_creation_ctx)
{
push_warning_printf(thd,
MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TRG_INVALID_CREATION_CTX,
ER(ER_TRG_INVALID_CREATION_CTX),
(const char *) db_name,
(const char *) table_name);
}
/*
If we failed to resolve the database collation, load the default one
from the disk.
*/
if (!db_cl)
db_cl= get_default_db_collation(thd, db_name);
return new Trigger_creation_ctx(client_cs, connection_cl, db_cl);
}
/*************************************************************************/
static const LEX_STRING triggers_file_type=
{ C_STRING_WITH_LEN("TRIGGERS") };
const char * const TRG_EXT= ".TRG";
/**
Table of .TRG file field descriptors.
We have here only one field now because in nearest future .TRG
files will be merged into .FRM files (so we don't need something
like md5 or created fields).
*/
static File_option triggers_file_parameters[]=
{
{
{ C_STRING_WITH_LEN("triggers") },
my_offsetof(class Table_triggers_list, definitions_list),
FILE_OPTIONS_STRLIST
},
{
{ C_STRING_WITH_LEN("sql_modes") },
my_offsetof(class Table_triggers_list, definition_modes_list),
FILE_OPTIONS_ULLLIST
},
{
{ C_STRING_WITH_LEN("definers") },
my_offsetof(class Table_triggers_list, definers_list),
FILE_OPTIONS_STRLIST
},
{
{ C_STRING_WITH_LEN("client_cs_names") },
my_offsetof(class Table_triggers_list, client_cs_names),
FILE_OPTIONS_STRLIST
},
{
{ C_STRING_WITH_LEN("connection_cl_names") },
my_offsetof(class Table_triggers_list, connection_cl_names),
FILE_OPTIONS_STRLIST
},
{
{ C_STRING_WITH_LEN("db_cl_names") },
my_offsetof(class Table_triggers_list, db_cl_names),
FILE_OPTIONS_STRLIST
},
{ { 0, 0 }, 0, FILE_OPTIONS_STRING }
};
File_option sql_modes_parameters=
{
{ C_STRING_WITH_LEN("sql_modes") },
my_offsetof(class Table_triggers_list, definition_modes_list),
FILE_OPTIONS_ULLLIST
};
/**
This must be kept up to date whenever a new option is added to the list
above, as it specifies the number of required parameters of the trigger in
.trg file.
*/
static const int TRG_NUM_REQUIRED_PARAMETERS= 6;
/*
Structure representing contents of .TRN file which are used to support
database wide trigger namespace.
*/
struct st_trigname
{
LEX_STRING trigger_table;
};
static const LEX_STRING trigname_file_type=
{ C_STRING_WITH_LEN("TRIGGERNAME") };
const char * const TRN_EXT= ".TRN";
static File_option trigname_file_parameters[]=
{
{
{ C_STRING_WITH_LEN("trigger_table")},
offsetof(struct st_trigname, trigger_table),
FILE_OPTIONS_ESTRING
},
{ { 0, 0 }, 0, FILE_OPTIONS_STRING }
};
const LEX_STRING trg_action_time_type_names[]=
{
{ C_STRING_WITH_LEN("BEFORE") },
{ C_STRING_WITH_LEN("AFTER") }
};
const LEX_STRING trg_event_type_names[]=
{
{ C_STRING_WITH_LEN("INSERT") },
{ C_STRING_WITH_LEN("UPDATE") },
{ C_STRING_WITH_LEN("DELETE") }
};
class Handle_old_incorrect_sql_modes_hook: public Unknown_key_hook
{
private:
char *path;
public:
Handle_old_incorrect_sql_modes_hook(char *file_path)
:path(file_path)
{};
virtual bool process_unknown_string(char *&unknown_key, uchar* base,
MEM_ROOT *mem_root, char *end);
};
class Handle_old_incorrect_trigger_table_hook: public Unknown_key_hook
{
public:
Handle_old_incorrect_trigger_table_hook(char *file_path,
LEX_STRING *trigger_table_arg)
:path(file_path), trigger_table_value(trigger_table_arg)
{};
virtual bool process_unknown_string(char *&unknown_key, uchar* base,
MEM_ROOT *mem_root, char *end);
private:
char *path;
LEX_STRING *trigger_table_value;
};
/**
An error handler that catches all non-OOM errors which can occur during
parsing of trigger body. Such errors are ignored and corresponding error
message is used to construct a more verbose error message which contains
name of problematic trigger. This error message is later emitted when
one tries to perform DML or some of DDL on this table.
Also, if possible, grabs name of the trigger being parsed so it can be
used to correctly drop problematic trigger.
*/
class Deprecated_trigger_syntax_handler : public Internal_error_handler
{
private:
char m_message[MYSQL_ERRMSG_SIZE];
LEX_STRING *m_trigger_name;
public:
Deprecated_trigger_syntax_handler() : m_trigger_name(NULL) {}
virtual bool handle_condition(THD *thd,
uint sql_errno,
const char* sqlstate,
MYSQL_ERROR::enum_warning_level level,
const char* message,
MYSQL_ERROR ** cond_hdl)
{
if (sql_errno != EE_OUTOFMEMORY &&
sql_errno != ER_OUT_OF_RESOURCES)
{
if(thd->lex->spname)
m_trigger_name= &thd->lex->spname->m_name;
if (m_trigger_name)
my_snprintf(m_message, sizeof(m_message),
ER(ER_ERROR_IN_TRIGGER_BODY),
m_trigger_name->str, message);
else
my_snprintf(m_message, sizeof(m_message),
ER(ER_ERROR_IN_UNKNOWN_TRIGGER_BODY), message);
return true;
}
return false;
}
LEX_STRING *get_trigger_name() { return m_trigger_name; }
char *get_error_message() { return m_message; }
};
/**
Create or drop trigger for table.
@param thd current thread context (including trigger definition in LEX)
@param tables table list containing one table for which trigger is created.
@param create whenever we create (TRUE) or drop (FALSE) trigger
@note
This function is mainly responsible for opening and locking of table and
invalidation of all its instances in table cache after trigger creation.
Real work on trigger creation/dropping is done inside Table_triggers_list
methods.
@todo
TODO: We should check if user has TRIGGER privilege for table here.
Now we just require SUPER privilege for creating/dropping because
we don't have proper privilege checking for triggers in place yet.
@retval
FALSE Success
@retval
TRUE error
*/
bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create)
{
/*
FIXME: The code below takes too many different paths depending on the
'create' flag, so that the justification for a single function
'mysql_create_or_drop_trigger', compared to two separate functions
'mysql_create_trigger' and 'mysql_drop_trigger' is not apparent.
This is a good candidate for a minor refactoring.
*/
TABLE *table;
bool result= TRUE;
String stmt_query;
bool lock_upgrade_done= FALSE;
MDL_ticket *mdl_ticket= NULL;
Query_tables_list backup;
DBUG_ENTER("mysql_create_or_drop_trigger");
/* Charset of the buffer for statement must be system one. */
stmt_query.set_charset(system_charset_info);
/*
QQ: This function could be merged in mysql_alter_table() function
But do we want this ?
*/
/*
Note that once we will have check for TRIGGER privilege in place we won't
need second part of condition below, since check_access() function also
checks that db is specified.
*/
if (!thd->lex->spname->m_db.length || (create && !tables->db_length))
{
my_error(ER_NO_DB_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/*
We don't allow creating triggers on tables in the 'mysql' schema
*/
if (create && !my_strcasecmp(system_charset_info, "mysql", tables->db))
{
my_error(ER_NO_TRIGGERS_ON_SYSTEM_SCHEMA, MYF(0));
DBUG_RETURN(TRUE);
}
/*
There is no DETERMINISTIC clause for triggers, so can't check it.
But a trigger can in theory be used to do nasty things (if it supported
DROP for example) so we do the check for privileges. For now there is
already a stronger test right above; but when this stronger test will
be removed, the test below will hold. Because triggers have the same
nature as functions regarding binlogging: their body is implicitly
binlogged, so they share the same danger, so trust_function_creators
applies to them too.
*/
if (!trust_function_creators && mysql_bin_log.is_open() &&
!(thd->security_ctx->master_access & SUPER_ACL))
{
my_error(ER_BINLOG_CREATE_ROUTINE_NEED_SUPER, MYF(0));
DBUG_RETURN(TRUE);
}
if (!create)
{
bool if_exists= thd->lex->drop_if_exists;
/*
Protect the query table list from the temporary and potentially
destructive changes necessary to open the trigger's table.
*/
thd->lex->reset_n_backup_query_tables_list(&backup);
/*
Restore Query_tables_list::sql_command, which was
reset above, as the code that writes the query to the
binary log assumes that this value corresponds to the
statement that is being executed.
*/
thd->lex->sql_command= backup.sql_command;
if (opt_readonly && !(thd->security_ctx->master_access & SUPER_ACL) &&
!thd->slave_thread)
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
goto end;
}
if (add_table_for_trigger(thd, thd->lex->spname, if_exists, & tables))
goto end;
if (!tables)
{
DBUG_ASSERT(if_exists);
/*
Since the trigger does not exist, there is no associated table,
and therefore :
- no TRIGGER privileges to check,
- no trigger to drop,
- no table to lock/modify,
so the drop statement is successful.
*/
result= FALSE;
/* Still, we need to log the query ... */
stmt_query.append(thd->query(), thd->query_length());
goto end;
}
}
/*
Check that the user has TRIGGER privilege on the subject table.
*/
{
bool err_status;
TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
thd->lex->query_tables_own_last= 0;
err_status= check_table_access(thd, TRIGGER_ACL, tables, FALSE, 1, FALSE);
thd->lex->query_tables_own_last= save_query_tables_own_last;
if (err_status)
goto end;
}
/* We should have only one table in table list. */
DBUG_ASSERT(tables->next_global == 0);
/* We do not allow creation of triggers on temporary tables. */
if (create && find_temporary_table(thd, tables))
{
my_error(ER_TRG_ON_VIEW_OR_TEMP_TABLE, MYF(0), tables->alias);
goto end;
}
/* We also don't allow creation of triggers on views. */
tables->required_type= FRMTYPE_TABLE;
/*
Also prevent DROP TRIGGER from opening temporary table which might
shadow base table on which trigger to be dropped is defined.
*/
tables->open_type= OT_BASE_ONLY;
/* Keep consistent with respect to other DDL statements */
mysql_ha_rm_tables(thd, tables);
if (thd->locked_tables_mode)
{
/* Under LOCK TABLES we must only accept write locked tables. */
if (!(tables->table= find_table_for_mdl_upgrade(thd, tables->db,
tables->table_name,
FALSE)))
goto end;
}
else
{
tables->table= open_n_lock_single_table(thd, tables,
TL_READ_NO_INSERT, 0);
if (! tables->table)
goto end;
tables->table->use_all_columns();
}
table= tables->table;
/* Later on we will need it to downgrade the lock */
mdl_ticket= table->mdl_ticket;
if (wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
goto end;
lock_upgrade_done= TRUE;
if (!table->triggers)
{
if (!create)
{
my_error(ER_TRG_DOES_NOT_EXIST, MYF(0));
goto end;
}
if (!(table->triggers= new (&table->mem_root) Table_triggers_list(table)))
goto end;
}
result= (create ?
table->triggers->create_trigger(thd, tables, &stmt_query):
table->triggers->drop_trigger(thd, tables, &stmt_query));
if (result)
goto end;
close_all_tables_for_name(thd, table->s, FALSE);
/*
Reopen the table if we were under LOCK TABLES.
Ignore the return value for now. It's better to
keep master/slave in consistent state.
*/
thd->locked_tables_list.reopen_tables(thd);
/*
Invalidate SP-cache. That's needed because triggers may change list of
pre-locking tables.
*/
sp_cache_invalidate();
end:
if (!result)
{
result= write_bin_log(thd, TRUE, stmt_query.ptr(), stmt_query.length());
}
/*
If we are under LOCK TABLES we should restore original state of
meta-data locks. Otherwise all locks will be released along
with the implicit commit.
*/
if (thd->locked_tables_mode && tables && lock_upgrade_done)
mdl_ticket->downgrade_exclusive_lock(MDL_SHARED_NO_READ_WRITE);
/* Restore the query table list. Used only for drop trigger. */
if (!create)
thd->lex->restore_backup_query_tables_list(&backup);
if (!result)
my_ok(thd);
DBUG_RETURN(result);
}
/**
Create trigger for table.
@param thd current thread context (including trigger definition in
LEX)
@param tables table list containing one open table for which the
trigger is created.
@param[out] stmt_query after successful return, this string contains
well-formed statement for creation this trigger.
@note
- Assumes that trigger name is fully qualified.
- NULL-string means the following LEX_STRING instance:
{ str = 0; length = 0 }.
- In other words, definer_user and definer_host should contain
simultaneously NULL-strings (non-SUID/old trigger) or valid strings
(SUID/new trigger).
@retval
False success
@retval
True error
*/
bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables,
String *stmt_query)
{
LEX *lex= thd->lex;
TABLE *table= tables->table;
char file_buff[FN_REFLEN], trigname_buff[FN_REFLEN];
LEX_STRING file, trigname_file;
LEX_STRING *trg_def;
LEX_STRING definer_user;
LEX_STRING definer_host;
ulonglong *trg_sql_mode;
char trg_definer_holder[USER_HOST_BUFF_SIZE];
LEX_STRING *trg_definer;
Item_trigger_field *trg_field;
struct st_trigname trigname;
LEX_STRING *trg_client_cs_name;
LEX_STRING *trg_connection_cl_name;
LEX_STRING *trg_db_cl_name;
if (check_for_broken_triggers())
return true;
/* Trigger must be in the same schema as target table. */
if (my_strcasecmp(table_alias_charset, table->s->db.str,
lex->spname->m_db.str))
{
my_error(ER_TRG_IN_WRONG_SCHEMA, MYF(0));
return 1;
}
/* We don't allow creation of several triggers of the same type yet */
if (bodies[lex->trg_chistics.event][lex->trg_chistics.action_time] != 0)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0),
"multiple triggers with the same action time"
" and event for one table");
return 1;
}
if (!lex->definer)
{
/*
DEFINER-clause is missing.
If we are in slave thread, this means that we received CREATE TRIGGER
from the master, that does not support definer in triggers. So, we
should mark this trigger as non-SUID. Note that this does not happen
when we parse triggers' definitions during opening .TRG file.
LEX::definer is ignored in that case.
Otherwise, we should use CURRENT_USER() as definer.
NOTE: when CREATE TRIGGER statement is allowed to be executed in PS/SP,
it will be required to create the definer below in persistent MEM_ROOT
of PS/SP.
*/
if (!thd->slave_thread)
{
if (!(lex->definer= create_default_definer(thd)))
return 1;
}
}
/*
If the specified definer differs from the current user, we should check
that the current user has SUPER privilege (in order to create trigger
under another user one must have SUPER privilege).
*/
if (lex->definer &&
(strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
my_strcasecmp(system_charset_info,
lex->definer->host.str,
thd->security_ctx->priv_host)))
{
if (check_global_access(thd, SUPER_ACL))
{
my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
return TRUE;
}
}
/*
Let us check if all references to fields in old/new versions of row in
this trigger are ok.
NOTE: We do it here more from ease of use standpoint. We still have to
do some checks on each execution. E.g. we can catch privilege changes
only during execution. Also in near future, when we will allow access
to other tables from trigger we won't be able to catch changes in other
tables...
Since we don't plan to access to contents of the fields it does not
matter that we choose for both OLD and NEW values the same versions
of Field objects here.
*/
old_field= new_field= table->field;
for (trg_field= lex->trg_table_fields.first;
trg_field; trg_field= trg_field->next_trg_field)
{
/*
NOTE: now we do not check privileges at CREATE TRIGGER time. This will
be changed in the future.
*/
trg_field->setup_field(thd, table, NULL);
if (!trg_field->fixed &&
trg_field->fix_fields(thd, (Item **)0))
return 1;
}
/*
Here we are creating file with triggers and save all triggers in it.
sql_create_definition_file() files handles renaming and backup of older
versions
*/
file.length= build_table_filename(file_buff, FN_REFLEN - 1,
tables->db, tables->table_name,
TRG_EXT, 0);
file.str= file_buff;
trigname_file.length= build_table_filename(trigname_buff, FN_REFLEN-1,
tables->db,
lex->spname->m_name.str,
TRN_EXT, 0);
trigname_file.str= trigname_buff;
/* Use the filesystem to enforce trigger namespace constraints. */
if (!access(trigname_buff, F_OK))
{
my_error(ER_TRG_ALREADY_EXISTS, MYF(0));
return 1;
}
trigname.trigger_table.str= tables->table_name;
trigname.trigger_table.length= tables->table_name_length;
if (sql_create_definition_file(NULL, &trigname_file, &trigname_file_type,
(uchar*)&trigname, trigname_file_parameters))
return 1;
/*
Soon we will invalidate table object and thus Table_triggers_list object
so don't care about place to which trg_def->ptr points and other
invariants (e.g. we don't bother to update names_list)
QQ: Hmm... probably we should not care about setting up active thread
mem_root too.
*/
if (!(trg_def= alloc_lex_string(&table->mem_root)) ||
definitions_list.push_back(trg_def, &table->mem_root) ||
!(trg_sql_mode= alloc_type<ulonglong>(&table->mem_root)) ||
definition_modes_list.push_back(trg_sql_mode, &table->mem_root) ||
!(trg_definer= alloc_lex_string(&table->mem_root)) ||
definers_list.push_back(trg_definer, &table->mem_root) ||
!(trg_client_cs_name= alloc_lex_string(&table->mem_root)) ||
client_cs_names.push_back(trg_client_cs_name, &table->mem_root) ||
!(trg_connection_cl_name= alloc_lex_string(&table->mem_root)) ||
connection_cl_names.push_back(trg_connection_cl_name, &table->mem_root) ||
!(trg_db_cl_name= alloc_lex_string(&table->mem_root)) ||
db_cl_names.push_back(trg_db_cl_name, &table->mem_root))
{
goto err_with_cleanup;
}
*trg_sql_mode= thd->variables.sql_mode;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (lex->definer && !is_acl_user(lex->definer->host.str,
lex->definer->user.str))
{
push_warning_printf(thd,
MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_NO_SUCH_USER,
ER(ER_NO_SUCH_USER),
lex->definer->user.str,
lex->definer->host.str);
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
if (lex->definer)
{
/* SUID trigger. */
definer_user= lex->definer->user;
definer_host= lex->definer->host;
trg_definer->str= trg_definer_holder;
trg_definer->length= strxmov(trg_definer->str, definer_user.str, "@",
definer_host.str, NullS) - trg_definer->str;
}
else
{
/* non-SUID trigger. */
definer_user.str= 0;
definer_user.length= 0;
definer_host.str= 0;
definer_host.length= 0;
trg_definer->str= (char*) "";
trg_definer->length= 0;
}
/*
Fill character set information:
- client character set contains charset info only;
- connection collation contains pair {character set, collation};
- database collation contains pair {character set, collation};
*/
lex_string_set(trg_client_cs_name, thd->charset()->csname);
lex_string_set(trg_connection_cl_name,
thd->variables.collation_connection->name);
lex_string_set(trg_db_cl_name,
get_default_db_collation(thd, tables->db)->name);
/*
Create well-formed trigger definition query. Original query is not
appropriated, because definer-clause can be not truncated.
*/
stmt_query->append(STRING_WITH_LEN("CREATE "));
if (trg_definer)
{
/*
Append definer-clause if the trigger is SUID (a usual trigger in
new MySQL versions).
*/
append_definer(thd, stmt_query, &definer_user, &definer_host);
}
LEX_STRING stmt_definition;
stmt_definition.str= (char*) thd->lex->stmt_definition_begin;
stmt_definition.length= thd->lex->stmt_definition_end
- thd->lex->stmt_definition_begin;
trim_whitespace(thd->charset(), & stmt_definition);
stmt_query->append(stmt_definition.str, stmt_definition.length);
trg_def->str= stmt_query->c_ptr();
trg_def->length= stmt_query->length();
/* Create trigger definition file. */
if (!sql_create_definition_file(NULL, &file, &triggers_file_type,
(uchar*)this, triggers_file_parameters))
return 0;
err_with_cleanup:
mysql_file_delete(key_file_trn, trigname_buff, MYF(MY_WME));
return 1;
}
/**
Deletes the .TRG file for a table.
@param path char buffer of size FN_REFLEN to be used
for constructing path to .TRG file.
@param db table's database name
@param table_name table's name
@retval
False success
@retval
True error
*/
static bool rm_trigger_file(char *path, const char *db,
const char *table_name)
{
build_table_filename(path, FN_REFLEN-1, db, table_name, TRG_EXT, 0);
return mysql_file_delete(key_file_trg, path, MYF(MY_WME));
}
/**
Deletes the .TRN file for a trigger.
@param path char buffer of size FN_REFLEN to be used
for constructing path to .TRN file.
@param db trigger's database name
@param trigger_name trigger's name
@retval
False success
@retval
True error
*/
static bool rm_trigname_file(char *path, const char *db,
const char *trigger_name)
{
build_table_filename(path, FN_REFLEN - 1, db, trigger_name, TRN_EXT, 0);
return mysql_file_delete(key_file_trn, path, MYF(MY_WME));
}
/**
Helper function that saves .TRG file for Table_triggers_list object.
@param triggers Table_triggers_list object for which file should be saved
@param db Name of database for subject table
@param table_name Name of subject table
@retval
FALSE Success
@retval
TRUE Error
*/
static bool save_trigger_file(Table_triggers_list *triggers, const char *db,
const char *table_name)
{
char file_buff[FN_REFLEN];
LEX_STRING file;
file.length= build_table_filename(file_buff, FN_REFLEN - 1, db, table_name,
TRG_EXT, 0);
file.str= file_buff;
return sql_create_definition_file(NULL, &file, &triggers_file_type,
(uchar*)triggers, triggers_file_parameters);
}
/**
Drop trigger for table.
@param thd current thread context
(including trigger definition in LEX)
@param tables table list containing one open table for which trigger
is dropped.
@param[out] stmt_query after successful return, this string contains
well-formed statement for creation this trigger.
@todo
Probably instead of removing .TRG file we should move
to archive directory but this should be done as part of
parse_file.cc functionality (because we will need it
elsewhere).
@retval
False success
@retval
True error
*/
bool Table_triggers_list::drop_trigger(THD *thd, TABLE_LIST *tables,
String *stmt_query)
{
const char *sp_name= thd->lex->spname->m_name.str; // alias
LEX_STRING *name;
char path[FN_REFLEN];
List_iterator_fast<LEX_STRING> it_name(names_list);
List_iterator<ulonglong> it_mod(definition_modes_list);
List_iterator<LEX_STRING> it_def(definitions_list);
List_iterator<LEX_STRING> it_definer(definers_list);
List_iterator<LEX_STRING> it_client_cs_name(client_cs_names);
List_iterator<LEX_STRING> it_connection_cl_name(connection_cl_names);
List_iterator<LEX_STRING> it_db_cl_name(db_cl_names);
stmt_query->append(thd->query(), thd->query_length());
while ((name= it_name++))
{
it_def++;
it_mod++;
it_definer++;
it_client_cs_name++;
it_connection_cl_name++;
it_db_cl_name++;
if (my_strcasecmp(table_alias_charset, sp_name, name->str) == 0)
{
/*
Again we don't care much about other things required for
clean trigger removing since table will be reopened anyway.
*/
it_def.remove();
it_mod.remove();
it_definer.remove();
it_client_cs_name.remove();
it_connection_cl_name.remove();
it_db_cl_name.remove();
if (definitions_list.is_empty())
{
/*
TODO: Probably instead of removing .TRG file we should move
to archive directory but this should be done as part of
parse_file.cc functionality (because we will need it
elsewhere).
*/
if (rm_trigger_file(path, tables->db, tables->table_name))
return 1;
}
else
{
if (save_trigger_file(this, tables->db, tables->table_name))
return 1;
}
if (rm_trigname_file(path, tables->db, sp_name))
return 1;
return 0;
}
}
my_message(ER_TRG_DOES_NOT_EXIST, ER(ER_TRG_DOES_NOT_EXIST), MYF(0));
return 1;
}
Table_triggers_list::~Table_triggers_list()
{
for (int i= 0; i < (int)TRG_EVENT_MAX; i++)
for (int j= 0; j < (int)TRG_ACTION_MAX; j++)
delete bodies[i][j];
if (record1_field)
for (Field **fld_ptr= record1_field; *fld_ptr; fld_ptr++)
delete *fld_ptr;
}
/**
Prepare array of Field objects referencing to TABLE::record[1] instead
of record[0] (they will represent OLD.* row values in ON UPDATE trigger
and in ON DELETE trigger which will be called during REPLACE execution).
@param table pointer to TABLE object for which we are creating fields.
@retval
False success
@retval
True error
*/
bool Table_triggers_list::prepare_record1_accessors(TABLE *table)
{
Field **fld, **old_fld;
if (!(record1_field= (Field **)alloc_root(&table->mem_root,
(table->s->fields + 1) *
sizeof(Field*))))
return 1;
for (fld= table->field, old_fld= record1_field; *fld; fld++, old_fld++)
{
/*
QQ: it is supposed that it is ok to use this function for field
cloning...
*/
if (!(*old_fld= (*fld)->new_field(&table->mem_root, table,
table == (*fld)->table)))
return 1;
(*old_fld)->move_field_offset((my_ptrdiff_t)(table->record[1] -
table->record[0]));
}
*old_fld= 0;
return 0;
}
/**
Adjust Table_triggers_list with new TABLE pointer.
@param new_table new pointer to TABLE instance
*/
void Table_triggers_list::set_table(TABLE *new_table)
{
trigger_table= new_table;
for (Field **field= new_table->triggers->record1_field ; *field ; field++)
{
(*field)->table= (*field)->orig_table= new_table;
(*field)->table_name= &new_table->alias;
}
}
/**
Check whenever .TRG file for table exist and load all triggers it contains.
@param thd current thread context
@param db table's database name
@param table_name table's name
@param table pointer to table object
@param names_only stop after loading trigger names
@todo
A lot of things to do here e.g. how about other funcs and being
more paranoical ?
@todo
This could be avoided if there is no triggers for UPDATE and DELETE.
@retval
False success
@retval
True error
*/
bool Table_triggers_list::check_n_load(THD *thd, const char *db,
const char *table_name, TABLE *table,
bool names_only)
{
char path_buff[FN_REFLEN];
LEX_STRING path;
File_parser *parser;
LEX_STRING save_db;
DBUG_ENTER("Table_triggers_list::check_n_load");
path.length= build_table_filename(path_buff, FN_REFLEN - 1,
db, table_name, TRG_EXT, 0);
path.str= path_buff;
// QQ: should we analyze errno somehow ?
if (access(path_buff, F_OK))
DBUG_RETURN(0);
/*
File exists so we got to load triggers.
FIXME: A lot of things to do here e.g. how about other funcs and being
more paranoical ?
*/
if ((parser= sql_parse_prepare(&path, &table->mem_root, 1)))
{
if (is_equal(&triggers_file_type, parser->type()))
{
Table_triggers_list *triggers=
new (&table->mem_root) Table_triggers_list(table);
Handle_old_incorrect_sql_modes_hook sql_modes_hook(path.str);
if (!triggers)
DBUG_RETURN(1);
/*
We don't have the following attributes in old versions of .TRG file, so
we should initialize the list for safety:
- sql_modes;
- definers;
- character sets (client, connection, database);
*/
triggers->definition_modes_list.empty();
triggers->definers_list.empty();
triggers->client_cs_names.empty();
triggers->connection_cl_names.empty();
triggers->db_cl_names.empty();
if (parser->parse((uchar*)triggers, &table->mem_root,
triggers_file_parameters,
TRG_NUM_REQUIRED_PARAMETERS,
&sql_modes_hook))
DBUG_RETURN(1);
List_iterator_fast<LEX_STRING> it(triggers->definitions_list);
LEX_STRING *trg_create_str;
ulonglong *trg_sql_mode;
if (triggers->definition_modes_list.is_empty() &&
!triggers->definitions_list.is_empty())
{
/*
It is old file format => we should fill list of sql_modes.
We use one mode (current) for all triggers, because we have not
information about mode in old format.
*/
if (!(trg_sql_mode= alloc_type<ulonglong>(&table->mem_root)))
{
DBUG_RETURN(1); // EOM
}
*trg_sql_mode= global_system_variables.sql_mode;
while (it++)
{
if (triggers->definition_modes_list.push_back(trg_sql_mode,
&table->mem_root))
{
DBUG_RETURN(1); // EOM
}
}
it.rewind();
}
if (triggers->definers_list.is_empty() &&
!triggers->definitions_list.is_empty())
{
/*
It is old file format => we should fill list of definers.
If there is no definer information, we should not switch context to
definer when checking privileges. I.e. privileges for such triggers
are checked for "invoker" rather than for "definer".
*/
LEX_STRING *trg_definer;
if (!(trg_definer= alloc_lex_string(&table->mem_root)))
DBUG_RETURN(1); // EOM
trg_definer->str= (char*) "";
trg_definer->length= 0;
while (it++)
{
if (triggers->definers_list.push_back(trg_definer,
&table->mem_root))
{
DBUG_RETURN(1); // EOM
}
}
it.rewind();
}
if (!triggers->definitions_list.is_empty() &&
(triggers->client_cs_names.is_empty() ||
triggers->connection_cl_names.is_empty() ||
triggers->db_cl_names.is_empty()))
{
/*
It is old file format => we should fill lists of character sets.
*/
LEX_STRING *trg_client_cs_name;
LEX_STRING *trg_connection_cl_name;
LEX_STRING *trg_db_cl_name;
if (!triggers->client_cs_names.is_empty() ||
!triggers->connection_cl_names.is_empty() ||
!triggers->db_cl_names.is_empty())
{
my_error(ER_TRG_CORRUPTED_FILE, MYF(0),
(const char *) db,
(const char *) table_name);
DBUG_RETURN(1); // EOM
}
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TRG_NO_CREATION_CTX,
ER(ER_TRG_NO_CREATION_CTX),
(const char*) db,
(const char*) table_name);
if (!(trg_client_cs_name= alloc_lex_string(&table->mem_root)) ||
!(trg_connection_cl_name= alloc_lex_string(&table->mem_root)) ||
!(trg_db_cl_name= alloc_lex_string(&table->mem_root)))
{
DBUG_RETURN(1); // EOM
}
/*
Backward compatibility: assume that the query is in the current
character set.
*/
lex_string_set(trg_client_cs_name,
thd->variables.character_set_client->csname);
lex_string_set(trg_connection_cl_name,
thd->variables.collation_connection->name);
lex_string_set(trg_db_cl_name,
thd->variables.collation_database->name);
while (it++)
{
if (triggers->client_cs_names.push_back(trg_client_cs_name,
&table->mem_root) ||
triggers->connection_cl_names.push_back(trg_connection_cl_name,
&table->mem_root) ||
triggers->db_cl_names.push_back(trg_db_cl_name,
&table->mem_root))
{
DBUG_RETURN(1); // EOM
}
}
it.rewind();
}
DBUG_ASSERT(triggers->definition_modes_list.elements ==
triggers->definitions_list.elements);
DBUG_ASSERT(triggers->definers_list.elements ==
triggers->definitions_list.elements);
DBUG_ASSERT(triggers->client_cs_names.elements ==
triggers->definitions_list.elements);
DBUG_ASSERT(triggers->connection_cl_names.elements ==
triggers->definitions_list.elements);
DBUG_ASSERT(triggers->db_cl_names.elements ==
triggers->definitions_list.elements);
table->triggers= triggers;
/*
TODO: This could be avoided if there is no triggers
for UPDATE and DELETE.
*/
if (!names_only && triggers->prepare_record1_accessors(table))
DBUG_RETURN(1);
List_iterator_fast<ulonglong> itm(triggers->definition_modes_list);
List_iterator_fast<LEX_STRING> it_definer(triggers->definers_list);
List_iterator_fast<LEX_STRING> it_client_cs_name(triggers->client_cs_names);
List_iterator_fast<LEX_STRING> it_connection_cl_name(triggers->connection_cl_names);
List_iterator_fast<LEX_STRING> it_db_cl_name(triggers->db_cl_names);
LEX *old_lex= thd->lex, lex;
sp_rcontext *save_spcont= thd->spcont;
ulong save_sql_mode= thd->variables.sql_mode;
LEX_STRING *on_table_name;
thd->lex= &lex;
save_db.str= thd->db;
save_db.length= thd->db_length;
thd->reset_db((char*) db, strlen(db));
while ((trg_create_str= it++))
{
sp_head *sp;
trg_sql_mode= itm++;
LEX_STRING *trg_definer= it_definer++;
thd->variables.sql_mode= (ulong)*trg_sql_mode;
Parser_state parser_state;
if (parser_state.init(thd, trg_create_str->str, trg_create_str->length))
goto err_with_lex_cleanup;
Trigger_creation_ctx *creation_ctx=
Trigger_creation_ctx::create(thd,
db,
table_name,
it_client_cs_name++,
it_connection_cl_name++,
it_db_cl_name++);
lex_start(thd);
thd->spcont= NULL;
Deprecated_trigger_syntax_handler error_handler;
thd->push_internal_handler(&error_handler);
bool parse_error= parse_sql(thd, & parser_state, creation_ctx);
thd->pop_internal_handler();
/*
Not strictly necessary to invoke this method here, since we know
that we've parsed CREATE TRIGGER and not an
UPDATE/DELETE/INSERT/REPLACE/LOAD/CREATE TABLE, but we try to
maintain the invariant that this method is called for each
distinct statement, in case its logic is extended with other
types of analyses in future.
*/
lex.set_trg_event_type_for_tables();
if (parse_error)
{
if (!triggers->m_has_unparseable_trigger)
triggers->set_parse_error_message(error_handler.get_error_message());
/* Currently sphead is always set to NULL in case of a parse error */
DBUG_ASSERT(lex.sphead == 0);
if (error_handler.get_trigger_name())
{
LEX_STRING *trigger_name;
const LEX_STRING *orig_trigger_name= error_handler.get_trigger_name();
if (!(trigger_name= alloc_lex_string(&table->mem_root)) ||
!(trigger_name->str= strmake_root(&table->mem_root,
orig_trigger_name->str,
orig_trigger_name->length)))
goto err_with_lex_cleanup;
trigger_name->length= orig_trigger_name->length;
if (triggers->names_list.push_back(trigger_name,
&table->mem_root))
goto err_with_lex_cleanup;
}
else
{
/*
The Table_triggers_list is not constructed as a list of
trigger objects as one would expect, but rather of lists of
properties of equal length. Thus, even if we don't get the
trigger name, we still fill all in all the lists with
placeholders as we might otherwise create a skew in the
lists. Obviously, this has to be refactored.
*/
LEX_STRING *empty= alloc_lex_string(&table->mem_root);
if (!empty)
goto err_with_lex_cleanup;
empty->str= const_cast<char*>("");
empty->length= 0;
if (triggers->names_list.push_back(empty, &table->mem_root))
goto err_with_lex_cleanup;
}
lex_end(&lex);
continue;
}
lex.sphead->set_info(0, 0, &lex.sp_chistics, (ulong) *trg_sql_mode);
int event= lex.trg_chistics.event;
int action_time= lex.trg_chistics.action_time;
sp= triggers->bodies[event][action_time]= lex.sphead;
lex.sphead= NULL; /* Prevent double cleanup. */
sp->set_info(0, 0, &lex.sp_chistics, (ulong) *trg_sql_mode);
sp->set_creation_ctx(creation_ctx);
if (!trg_definer->length)
{
/*
This trigger was created/imported from the previous version of
MySQL, which does not support triggers definers. We should emit
warning here.
*/
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TRG_NO_DEFINER, ER(ER_TRG_NO_DEFINER),
(const char*) db,
(const char*) sp->m_name.str);
/*
Set definer to the '' to correct displaying in the information
schema.
*/
sp->set_definer((char*) "", 0);
/*
Triggers without definer information are executed under the
authorization of the invoker.
*/
sp->m_chistics->suid= SP_IS_NOT_SUID;
}
else
sp->set_definer(trg_definer->str, trg_definer->length);
if (triggers->names_list.push_back(&sp->m_name, &table->mem_root))
goto err_with_lex_cleanup;
if (!(on_table_name= alloc_lex_string(&table->mem_root)))
goto err_with_lex_cleanup;
on_table_name->str= (char*) lex.raw_trg_on_table_name_begin;
on_table_name->length= lex.raw_trg_on_table_name_end
- lex.raw_trg_on_table_name_begin;
if (triggers->on_table_names_list.push_back(on_table_name, &table->mem_root))
goto err_with_lex_cleanup;
#ifndef DBUG_OFF
/*
Let us check that we correctly update trigger definitions when we
rename tables with triggers.
In special cases like "RENAME TABLE `#mysql50#somename` TO `somename`"
or "ALTER DATABASE `#mysql50#somename` UPGRADE DATA DIRECTORY NAME"
we might be given table or database name with "#mysql50#" prefix (and
trigger's definiton contains un-prefixed version of the same name).
To remove this prefix we use check_n_cut_mysql50_prefix().
*/
char fname[NAME_LEN + 1];
DBUG_ASSERT((!my_strcasecmp(table_alias_charset, lex.query_tables->db, db) ||
(check_n_cut_mysql50_prefix(db, fname, sizeof(fname)) &&
!my_strcasecmp(table_alias_charset, lex.query_tables->db, fname))));
DBUG_ASSERT((!my_strcasecmp(table_alias_charset, lex.query_tables->table_name, table_name) ||
(check_n_cut_mysql50_prefix(table_name, fname, sizeof(fname)) &&
!my_strcasecmp(table_alias_charset, lex.query_tables->table_name, fname))));
#endif
if (names_only)
{
lex_end(&lex);
continue;
}
/*
Gather all Item_trigger_field objects representing access to fields
in old/new versions of row in trigger into lists containing all such
objects for the triggers with same action and timing.
*/
triggers->trigger_fields[lex.trg_chistics.event]
[lex.trg_chistics.action_time]=
lex.trg_table_fields.first;
/*
Also let us bind these objects to Field objects in table being
opened.
We ignore errors here, because if even something is wrong we still
will be willing to open table to perform some operations (e.g.
SELECT)...
Anyway some things can be checked only during trigger execution.
*/
for (Item_trigger_field *trg_field= lex.trg_table_fields.first;
trg_field;
trg_field= trg_field->next_trg_field)
{
trg_field->setup_field(thd, table,
&triggers->subject_table_grants[lex.trg_chistics.event]
[lex.trg_chistics.action_time]);
}
lex_end(&lex);
}
thd->reset_db(save_db.str, save_db.length);
thd->lex= old_lex;
thd->spcont= save_spcont;
thd->variables.sql_mode= save_sql_mode;
DBUG_RETURN(0);
err_with_lex_cleanup:
// QQ: anything else ?
lex_end(&lex);
thd->lex= old_lex;
thd->spcont= save_spcont;
thd->variables.sql_mode= save_sql_mode;
thd->reset_db(save_db.str, save_db.length);
DBUG_RETURN(1);
}
/*
We don't care about this error message much because .TRG files will
be merged into .FRM anyway.
*/
my_error(ER_WRONG_OBJECT, MYF(0),
table_name, TRG_EXT + 1, "TRIGGER");
DBUG_RETURN(1);
}
DBUG_RETURN(1);
}
/**
Obtains and returns trigger metadata.
@param thd current thread context
@param event trigger event type
@param time_type trigger action time
@param trigger_name returns name of trigger
@param trigger_stmt returns statement of trigger
@param sql_mode returns sql_mode of trigger
@param definer returns definer/creator of trigger. The caller is
responsible to allocate enough space for storing
definer information.
@retval
False success
@retval
True error
*/
bool Table_triggers_list::get_trigger_info(THD *thd, trg_event_type event,
trg_action_time_type time_type,
LEX_STRING *trigger_name,
LEX_STRING *trigger_stmt,
ulong *sql_mode,
LEX_STRING *definer,
LEX_STRING *client_cs_name,
LEX_STRING *connection_cl_name,
LEX_STRING *db_cl_name)
{
sp_head *body;
DBUG_ENTER("get_trigger_info");
if ((body= bodies[event][time_type]))
{
Stored_program_creation_ctx *creation_ctx=
bodies[event][time_type]->get_creation_ctx();
*trigger_name= body->m_name;
*trigger_stmt= body->m_body_utf8;
*sql_mode= body->m_sql_mode;
if (body->m_chistics->suid == SP_IS_NOT_SUID)
{
definer->str[0]= 0;
definer->length= 0;
}
else
{
definer->length= strxmov(definer->str, body->m_definer_user.str, "@",
body->m_definer_host.str, NullS) - definer->str;
}
lex_string_set(client_cs_name,
creation_ctx->get_client_cs()->csname);
lex_string_set(connection_cl_name,
creation_ctx->get_connection_cl()->name);
lex_string_set(db_cl_name,
creation_ctx->get_db_cl()->name);
DBUG_RETURN(0);
}
DBUG_RETURN(1);
}
void Table_triggers_list::get_trigger_info(THD *thd,
int trigger_idx,
LEX_STRING *trigger_name,
ulonglong *sql_mode,
LEX_STRING *sql_original_stmt,
LEX_STRING *client_cs_name,
LEX_STRING *connection_cl_name,
LEX_STRING *db_cl_name)
{
List_iterator_fast<LEX_STRING> it_trigger_name(names_list);
List_iterator_fast<ulonglong> it_sql_mode(definition_modes_list);
List_iterator_fast<LEX_STRING> it_sql_orig_stmt(definitions_list);
List_iterator_fast<LEX_STRING> it_client_cs_name(client_cs_names);
List_iterator_fast<LEX_STRING> it_connection_cl_name(connection_cl_names);
List_iterator_fast<LEX_STRING> it_db_cl_name(db_cl_names);
for (int i = 0; i < trigger_idx; ++i)
{
it_trigger_name.next_fast();
it_sql_mode.next_fast();
it_sql_orig_stmt.next_fast();
it_client_cs_name.next_fast();
it_connection_cl_name.next_fast();
it_db_cl_name.next_fast();
}
*trigger_name= *(it_trigger_name++);
*sql_mode= *(it_sql_mode++);
*sql_original_stmt= *(it_sql_orig_stmt++);
*client_cs_name= *(it_client_cs_name++);
*connection_cl_name= *(it_connection_cl_name++);
*db_cl_name= *(it_db_cl_name++);
}
int Table_triggers_list::find_trigger_by_name(const LEX_STRING *trg_name)
{
List_iterator_fast<LEX_STRING> it(names_list);
for (int i = 0; ; ++i)
{
LEX_STRING *cur_name= it++;
if (!cur_name)
return -1;
if (strcmp(cur_name->str, trg_name->str) == 0)
return i;
}
}
/**
Find trigger's table from trigger identifier and add it to
the statement table list.
@param[in] thd Thread context.
@param[in] trg_name Trigger name.
@param[in] if_exists TRUE if SQL statement contains "IF EXISTS" clause.
That means a warning instead of error should be
thrown if trigger with given name does not exist.
@param[out] table Pointer to TABLE_LIST object for the
table trigger.
@return Operation status
@retval FALSE On success.
@retval TRUE Otherwise.
*/
bool add_table_for_trigger(THD *thd,
const sp_name *trg_name,
bool if_exists,
TABLE_LIST **table)
{
LEX *lex= thd->lex;
char trn_path_buff[FN_REFLEN];
LEX_STRING trn_path= { trn_path_buff, 0 };
LEX_STRING tbl_name;
DBUG_ENTER("add_table_for_trigger");
build_trn_path(thd, trg_name, &trn_path);
if (check_trn_exists(&trn_path))
{
if (if_exists)
{
push_warning_printf(thd,
MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_TRG_DOES_NOT_EXIST,
ER(ER_TRG_DOES_NOT_EXIST));
*table= NULL;
DBUG_RETURN(FALSE);
}
my_error(ER_TRG_DOES_NOT_EXIST, MYF(0));
DBUG_RETURN(TRUE);
}
if (load_table_name_for_trigger(thd, trg_name, &trn_path, &tbl_name))
DBUG_RETURN(TRUE);
*table= sp_add_to_query_tables(thd, lex, trg_name->m_db.str,
tbl_name.str, TL_IGNORE,
MDL_SHARED_NO_WRITE);
DBUG_RETURN(*table ? FALSE : TRUE);
}
/**
Drop all triggers for table.
@param thd current thread context
@param db schema for table
@param name name for table
@retval
False success
@retval
True error
*/
bool Table_triggers_list::drop_all_triggers(THD *thd, char *db, char *name)
{
TABLE table;
char path[FN_REFLEN];
bool result= 0;
DBUG_ENTER("drop_all_triggers");
bzero(&table, sizeof(table));
init_sql_alloc(&table.mem_root, 8192, 0);
if (Table_triggers_list::check_n_load(thd, db, name, &table, 1))
{
result= 1;
goto end;
}
if (table.triggers)
{
LEX_STRING *trigger;
List_iterator_fast<LEX_STRING> it_name(table.triggers->names_list);
while ((trigger= it_name++))
{
/*
Trigger, which body we failed to parse during call
Table_triggers_list::check_n_load(), might be missing name.
Such triggers have zero-length name and are skipped here.
*/
if (trigger->length == 0)
continue;
if (rm_trigname_file(path, db, trigger->str))
{
/*
Instead of immediately bailing out with error if we were unable
to remove .TRN file we will try to drop other files.
*/
result= 1;
continue;
}
}
if (rm_trigger_file(path, db, name))
{
result= 1;
goto end;
}
}
end:
if (table.triggers)
delete table.triggers;
free_root(&table.mem_root, MYF(0));
DBUG_RETURN(result);
}
/**
Update .TRG file after renaming triggers' subject table
(change name of table in triggers' definitions).
@param thd Thread context
@param old_db_name Old database of subject table
@param new_db_name New database of subject table
@param old_table_name Old subject table's name
@param new_table_name New subject table's name
@retval
FALSE Success
@retval
TRUE Failure
*/
bool
Table_triggers_list::change_table_name_in_triggers(THD *thd,
const char *old_db_name,
const char *new_db_name,
LEX_STRING *old_table_name,
LEX_STRING *new_table_name)
{
char path_buff[FN_REFLEN];
LEX_STRING *def, *on_table_name, new_def;
ulong save_sql_mode= thd->variables.sql_mode;
List_iterator_fast<LEX_STRING> it_def(definitions_list);
List_iterator_fast<LEX_STRING> it_on_table_name(on_table_names_list);
List_iterator_fast<ulonglong> it_mode(definition_modes_list);
size_t on_q_table_name_len, before_on_len;
String buff;
DBUG_ASSERT(definitions_list.elements == on_table_names_list.elements &&
definitions_list.elements == definition_modes_list.elements);
while ((def= it_def++))
{
on_table_name= it_on_table_name++;
thd->variables.sql_mode= (ulong) *(it_mode++);
/* Construct CREATE TRIGGER statement with new table name. */
buff.length(0);
/* WARNING: 'on_table_name' is supposed to point inside 'def' */
DBUG_ASSERT(on_table_name->str > def->str);
DBUG_ASSERT(on_table_name->str < (def->str + def->length));
before_on_len= on_table_name->str - def->str;
buff.append(def->str, before_on_len);
buff.append(STRING_WITH_LEN("ON "));
append_identifier(thd, &buff, new_table_name->str, new_table_name->length);
buff.append(STRING_WITH_LEN(" "));
on_q_table_name_len= buff.length() - before_on_len;
buff.append(on_table_name->str + on_table_name->length,
def->length - (before_on_len + on_table_name->length));
/*
It is OK to allocate some memory on table's MEM_ROOT since this
table instance will be thrown out at the end of rename anyway.
*/
new_def.str= (char*) memdup_root(&trigger_table->mem_root, buff.ptr(),
buff.length());
new_def.length= buff.length();
on_table_name->str= new_def.str + before_on_len;
on_table_name->length= on_q_table_name_len;
*def= new_def;
}
thd->variables.sql_mode= save_sql_mode;
if (thd->is_fatal_error)
return TRUE; /* OOM */
if (save_trigger_file(this, new_db_name, new_table_name->str))
return TRUE;
if (rm_trigger_file(path_buff, old_db_name, old_table_name->str))
{
(void) rm_trigger_file(path_buff, new_db_name, new_table_name->str);
return TRUE;
}
return FALSE;
}
/**
Iterate though Table_triggers_list::names_list list and update
.TRN files after renaming triggers' subject table.
@param old_db_name Old database of subject table
@param new_db_name New database of subject table
@param new_table_name New subject table's name
@param stopper Pointer to Table_triggers_list::names_list at
which we should stop updating.
@retval
0 Success
@retval
non-0 Failure, pointer to Table_triggers_list::names_list element
for which update failed.
*/
LEX_STRING*
Table_triggers_list::change_table_name_in_trignames(const char *old_db_name,
const char *new_db_name,
LEX_STRING *new_table_name,
LEX_STRING *stopper)
{
char trigname_buff[FN_REFLEN];
struct st_trigname trigname;
LEX_STRING trigname_file;
LEX_STRING *trigger;
List_iterator_fast<LEX_STRING> it_name(names_list);
while ((trigger= it_name++) != stopper)
{
trigname_file.length= build_table_filename(trigname_buff, FN_REFLEN-1,
new_db_name, trigger->str,
TRN_EXT, 0);
trigname_file.str= trigname_buff;
trigname.trigger_table= *new_table_name;
if (sql_create_definition_file(NULL, &trigname_file, &trigname_file_type,
(uchar*)&trigname, trigname_file_parameters))
return trigger;
/* Remove stale .TRN file in case of database upgrade */
if (old_db_name)
{
if (rm_trigname_file(trigname_buff, old_db_name, trigger->str))
{
(void) rm_trigname_file(trigname_buff, new_db_name, trigger->str);
return trigger;
}
}
}
return 0;
}
/**
Update .TRG and .TRN files after renaming triggers' subject table.
@param[in,out] thd Thread context
@param[in] db Old database of subject table
@param[in] old_alias Old alias of subject table
@param[in] old_table Old name of subject table
@param[in] new_db New database for subject table
@param[in] new_table New name of subject table
@note
This method tries to leave trigger related files in consistent state,
i.e. it either will complete successfully, or will fail leaving files
in their initial state.
Also this method assumes that subject table is not renamed to itself.
This method needs to be called under an exclusive table metadata lock.
@retval FALSE Success
@retval TRUE Error
*/
bool Table_triggers_list::change_table_name(THD *thd, const char *db,
const char *old_alias,
const char *old_table,
const char *new_db,
const char *new_table)
{
TABLE table;
bool result= 0;
bool upgrading50to51= FALSE;
LEX_STRING *err_trigname;
DBUG_ENTER("change_table_name");
bzero(&table, sizeof(table));
init_sql_alloc(&table.mem_root, 8192, 0);
/*
This method interfaces the mysql server code protected by
an exclusive metadata lock.
*/
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE, db, old_table,
MDL_EXCLUSIVE));
DBUG_ASSERT(my_strcasecmp(table_alias_charset, db, new_db) ||
my_strcasecmp(table_alias_charset, old_alias, new_table));
if (Table_triggers_list::check_n_load(thd, db, old_table, &table, TRUE))
{
result= 1;
goto end;
}
if (table.triggers)
{
if (table.triggers->check_for_broken_triggers())
{
result= 1;
goto end;
}
LEX_STRING old_table_name= { (char *) old_alias, strlen(old_alias) };
LEX_STRING new_table_name= { (char *) new_table, strlen(new_table) };
/*
Since triggers should be in the same schema as their subject tables
moving table with them between two schemas raises too many questions.
(E.g. what should happen if in new schema we already have trigger
with same name ?).
In case of "ALTER DATABASE `#mysql50#db1` UPGRADE DATA DIRECTORY NAME"
we will be given table name with "#mysql50#" prefix
To remove this prefix we use check_n_cut_mysql50_prefix().
*/
if (my_strcasecmp(table_alias_charset, db, new_db))
{
char dbname[NAME_LEN + 1];
if (check_n_cut_mysql50_prefix(db, dbname, sizeof(dbname)) &&
!my_strcasecmp(table_alias_charset, dbname, new_db))
{
upgrading50to51= TRUE;
}
else
{
my_error(ER_TRG_IN_WRONG_SCHEMA, MYF(0));
result= 1;
goto end;
}
}
if (table.triggers->change_table_name_in_triggers(thd, db, new_db,
&old_table_name,
&new_table_name))
{
result= 1;
goto end;
}
if ((err_trigname= table.triggers->change_table_name_in_trignames(
upgrading50to51 ? db : NULL,
new_db, &new_table_name, 0)))
{
/*
If we were unable to update one of .TRN files properly we will
revert all changes that we have done and report about error.
We assume that we will be able to undo our changes without errors
(we can't do much if there will be an error anyway).
*/
(void) table.triggers->change_table_name_in_trignames(
upgrading50to51 ? new_db : NULL, db,
&old_table_name, err_trigname);
(void) table.triggers->change_table_name_in_triggers(
thd, db, new_db,
&new_table_name, &old_table_name);
result= 1;
goto end;
}
}
end:
delete table.triggers;
free_root(&table.mem_root, MYF(0));
DBUG_RETURN(result);
}
/**
Execute trigger for given (event, time) pair.
The operation executes trigger for the specified event (insert, update,
delete) and time (after, before) if it is set.
@param thd
@param event
@param time_type
@param old_row_is_record1
@return Error status.
@retval FALSE on success.
@retval TRUE on error.
*/
bool Table_triggers_list::process_triggers(THD *thd,
trg_event_type event,
trg_action_time_type time_type,
bool old_row_is_record1)
{
bool err_status;
Sub_statement_state statement_state;
sp_head *sp_trigger= bodies[event][time_type];
SELECT_LEX *save_current_select;
if (check_for_broken_triggers())
return true;
if (sp_trigger == NULL)
return FALSE;
if (old_row_is_record1)
{
old_field= record1_field;
new_field= trigger_table->field;
}
else
{
new_field= record1_field;
old_field= trigger_table->field;
}
/*
This trigger must have been processed by the pre-locking
algorithm.
*/
DBUG_ASSERT(trigger_table->pos_in_table_list->trg_event_map &
static_cast<uint>(1 << static_cast<int>(event)));
thd->reset_sub_statement_state(&statement_state, SUB_STMT_TRIGGER);
/*
Reset current_select before call execute_trigger() and
restore it after return from one. This way error is set
in case of failure during trigger execution.
*/
save_current_select= thd->lex->current_select;
thd->lex->current_select= NULL;
err_status=
sp_trigger->execute_trigger(thd,
&trigger_table->s->db,
&trigger_table->s->table_name,
&subject_table_grants[event][time_type]);
thd->lex->current_select= save_current_select;
thd->restore_sub_statement_state(&statement_state);
return err_status;
}
/**
Add triggers for table to the set of routines used by statement.
Add tables used by them to statement table list. Do the same for
routines used by triggers.
@param thd Thread context.
@param prelocking_ctx Prelocking context of the statement.
@param table_list Table list element for table with trigger.
@retval FALSE Success.
@retval TRUE Failure.
*/
bool
Table_triggers_list::
add_tables_and_routines_for_triggers(THD *thd,
Query_tables_list *prelocking_ctx,
TABLE_LIST *table_list)
{
DBUG_ASSERT(static_cast<int>(table_list->lock_type) >=
static_cast<int>(TL_WRITE_ALLOW_WRITE));
for (int i= 0; i < (int)TRG_EVENT_MAX; i++)
{
if (table_list->trg_event_map &
static_cast<uint8>(1 << static_cast<int>(i)))
{
for (int j= 0; j < (int)TRG_ACTION_MAX; j++)
{
/* We can have only one trigger per action type currently */
sp_head *trigger= table_list->table->triggers->bodies[i][j];
if (trigger)
{
MDL_key key(MDL_key::TRIGGER, trigger->m_db.str, trigger->m_name.str);
if (sp_add_used_routine(prelocking_ctx, thd->stmt_arena,
&key, table_list->belong_to_view))
{
trigger->add_used_tables_to_table_list(thd,
&prelocking_ctx->query_tables_last,
table_list->belong_to_view);
sp_update_stmt_used_routines(thd, prelocking_ctx,
&trigger->m_sroutines,
table_list->belong_to_view);
trigger->propagate_attributes(prelocking_ctx);
}
}
}
}
}
return FALSE;
}
/**
Mark fields of subject table which we read/set in its triggers
as such.
This method marks fields of subject table which are read/set in its
triggers as such (by properly updating TABLE::read_set/write_set)
and thus informs handler that values for these fields should be
retrieved/stored during execution of statement.
@param thd Current thread context
@param event Type of event triggers for which we are going to inspect
*/
void Table_triggers_list::mark_fields_used(trg_event_type event)
{
int action_time;
Item_trigger_field *trg_field;
for (action_time= 0; action_time < (int)TRG_ACTION_MAX; action_time++)
{
for (trg_field= trigger_fields[event][action_time]; trg_field;
trg_field= trg_field->next_trg_field)
{
/* We cannot mark fields which does not present in table. */
if (trg_field->field_idx != (uint)-1)
{
bitmap_set_bit(trigger_table->read_set, trg_field->field_idx);
if (trg_field->get_settable_routine_parameter())
bitmap_set_bit(trigger_table->write_set, trg_field->field_idx);
}
}
}
trigger_table->file->column_bitmaps_signal();
}
/**
Signals to the Table_triggers_list that a parse error has occured when
reading a trigger from file. This makes the Table_triggers_list enter an
error state flagged by m_has_unparseable_trigger == true. The error message
will be used whenever a statement invoking or manipulating triggers is
issued against the Table_triggers_list's table.
@param error_message The error message thrown by the parser.
*/
void Table_triggers_list::set_parse_error_message(char *error_message)
{
m_has_unparseable_trigger= true;
strcpy(m_parse_error_message, error_message);
}
/**
Trigger BUG#14090 compatibility hook.
@param[in,out] unknown_key reference on the line with unknown
parameter and the parsing point
@param[in] base base address for parameter writing
(structure like TABLE)
@param[in] mem_root MEM_ROOT for parameters allocation
@param[in] end the end of the configuration
@note
NOTE: this hook process back compatibility for incorrectly written
sql_modes parameter (see BUG#14090).
@retval
FALSE OK
@retval
TRUE Error
*/
#define INVALID_SQL_MODES_LENGTH 13
bool
Handle_old_incorrect_sql_modes_hook::process_unknown_string(char *&unknown_key,
uchar* base,
MEM_ROOT *mem_root,
char *end)
{
DBUG_ENTER("Handle_old_incorrect_sql_modes_hook::process_unknown_string");
DBUG_PRINT("info", ("unknown key: %60s", unknown_key));
if (unknown_key + INVALID_SQL_MODES_LENGTH + 1 < end &&
unknown_key[INVALID_SQL_MODES_LENGTH] == '=' &&
!memcmp(unknown_key, STRING_WITH_LEN("sql_modes")))
{
char *ptr= unknown_key + INVALID_SQL_MODES_LENGTH + 1;
DBUG_PRINT("info", ("sql_modes affected by BUG#14090 detected"));
push_warning_printf(current_thd,
MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_OLD_FILE_FORMAT,
ER(ER_OLD_FILE_FORMAT),
(char *)path, "TRIGGER");
if (get_file_options_ulllist(ptr, end, unknown_key, base,
&sql_modes_parameters, mem_root))
{
DBUG_RETURN(TRUE);
}
/*
Set parsing pointer to the last symbol of string (\n)
1) to avoid problem with \0 in the junk after sql_modes
2) to speed up skipping this line by parser.
*/
unknown_key= ptr-1;
}
DBUG_RETURN(FALSE);
}
#define INVALID_TRIGGER_TABLE_LENGTH 15
/**
Trigger BUG#15921 compatibility hook. For details see
Handle_old_incorrect_sql_modes_hook::process_unknown_string().
*/
bool
Handle_old_incorrect_trigger_table_hook::
process_unknown_string(char *&unknown_key, uchar* base, MEM_ROOT *mem_root,
char *end)
{
DBUG_ENTER("Handle_old_incorrect_trigger_table_hook::process_unknown_string");
DBUG_PRINT("info", ("unknown key: %60s", unknown_key));
if (unknown_key + INVALID_TRIGGER_TABLE_LENGTH + 1 < end &&
unknown_key[INVALID_TRIGGER_TABLE_LENGTH] == '=' &&
!memcmp(unknown_key, STRING_WITH_LEN("trigger_table")))
{
char *ptr= unknown_key + INVALID_TRIGGER_TABLE_LENGTH + 1;
DBUG_PRINT("info", ("trigger_table affected by BUG#15921 detected"));
push_warning_printf(current_thd,
MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_OLD_FILE_FORMAT,
ER(ER_OLD_FILE_FORMAT),
(char *)path, "TRIGGER");
if (!(ptr= parse_escaped_string(ptr, end, mem_root, trigger_table_value)))
{
my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0), "trigger_table",
unknown_key);
DBUG_RETURN(TRUE);
}
/* Set parsing pointer to the last symbol of string (\n). */
unknown_key= ptr-1;
}
DBUG_RETURN(FALSE);
}
/**
Contruct path to TRN-file.
@param thd[in] Thread context.
@param trg_name[in] Trigger name.
@param trn_path[out] Variable to store constructed path
*/
void build_trn_path(THD *thd, const sp_name *trg_name, LEX_STRING *trn_path)
{
/* Construct path to the TRN-file. */
trn_path->length= build_table_filename(trn_path->str,
FN_REFLEN - 1,
trg_name->m_db.str,
trg_name->m_name.str,
TRN_EXT,
0);
}
/**
Check if TRN-file exists.
@return
@retval TRUE if TRN-file does not exist.
@retval FALSE if TRN-file exists.
*/
bool check_trn_exists(const LEX_STRING *trn_path)
{
return access(trn_path->str, F_OK) != 0;
}
/**
Retrieve table name for given trigger.
@param thd[in] Thread context.
@param trg_name[in] Trigger name.
@param trn_path[in] Path to the corresponding TRN-file.
@param tbl_name[out] Variable to store retrieved table name.
@return Error status.
@retval FALSE on success.
@retval TRUE if table name could not be retrieved.
*/
bool load_table_name_for_trigger(THD *thd,
const sp_name *trg_name,
const LEX_STRING *trn_path,
LEX_STRING *tbl_name)
{
File_parser *parser;
struct st_trigname trn_data;
Handle_old_incorrect_trigger_table_hook trigger_table_hook(
trn_path->str,
&trn_data.trigger_table);
DBUG_ENTER("load_table_name_for_trigger");
/* Parse the TRN-file. */
if (!(parser= sql_parse_prepare(trn_path, thd->mem_root, TRUE)))
DBUG_RETURN(TRUE);
if (!is_equal(&trigname_file_type, parser->type()))
{
my_error(ER_WRONG_OBJECT, MYF(0),
trg_name->m_name.str,
TRN_EXT + 1,
"TRIGGERNAME");
DBUG_RETURN(TRUE);
}
if (parser->parse((uchar*) &trn_data, thd->mem_root,
trigname_file_parameters, 1,
&trigger_table_hook))
DBUG_RETURN(TRUE);
/* Copy trigger table name. */
*tbl_name= trn_data.trigger_table;
/* That's all. */
DBUG_RETURN(FALSE);
}
|